1. What is the chemical formula for rubies? Why are rubies red? 2. Identify six or more properties of minerals. 3. How does the hardness of a mineral relate to its chemical bonds? 4. How many minerals...

1. What is the chemical formula for rubies? Why are rubies red?

2. Identify six or more properties of minerals.

3. How does the hardness of a mineral relate to its chemical bonds?

4. How many minerals are known to exist? What are the two main groups into which minerals are classified?